diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 6893a025..beeb492e 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -3598,6 +3598,7 @@ Stefan Herdler <herdler@gmx.de>
  for reporting the index file of a recording not being regenerated in case it is
  present, but empty
  for reporting a missing check for self-assignment in the move assignment operator
+ for modifying handling channel names with source to make it thread safe
 
 Tobias Faust <tobias.faust@gmx.de>
  for the original "jumpingseconds" patch
diff --git a/HISTORY b/HISTORY
index 166e95f1..fe735ac6 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9887,8 +9887,10 @@ Video Disk Recorder Revision History
 - Fixed possible duplicate component entries in the info of an ongoing recording
   (reported by Christoph Haubrich).
 
-2024-03-01:
+2024-03-02:
 
 - Fixed the move assignment operator to check for self-assignment (suggested by
   Stefan Herdler).
 - Added missing initialization of cChannel::nameSourceMode (thanks to Winfried Köhler).
+- Modified handling channel names with source to make it thread safe (thanks to
+  Stefan Herdler).
diff --git a/channels.c b/channels.c
index 74e95f54..eacd7603 100644
--- a/channels.c
+++ b/channels.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: channels.c 5.2 2024/03/01 14:31:49 kls Exp $
+ * $Id: channels.c 5.3 2024/03/02 16:21:16 kls Exp $
  */
 
 #include "channels.h"
@@ -60,7 +60,6 @@ cChannel::cChannel(void)
   provider = strdup("");
   portalName = strdup("");
   memset(&__BeginData__, 0, (char *)&__EndData__ - (char *)&__BeginData__);
-  nameSourceMode = 0;
   parameters = "";
   modification = CHANNELMOD_NONE;
   seen         = 0;
@@ -98,23 +97,32 @@ cChannel& cChannel::operator= (const cChannel &Channel)
   provider = strcpyrealloc(provider, Channel.provider);
   portalName = strcpyrealloc(portalName, Channel.portalName);
   memcpy(&__BeginData__, &Channel.__BeginData__, (char *)&Channel.__EndData__ - (char *)&Channel.__BeginData__);
-  nameSource = NULL; // these will be recalculated automatically
-  nameSourceMode = 0;
-  shortNameSource = NULL;
+  UpdateNameSource();
   parameters = Channel.parameters;
   return *this;
 }
 
+void cChannel::UpdateNameSource(void)
+{
+  if (Setup.ShowChannelNamesWithSource == 0) {
+     nameSource = NULL;
+     shortNameSource = NULL;
+     return;
+     }
+
+  if (Setup.ShowChannelNamesWithSource == 1)
+     nameSource = cString::sprintf("%s (%c)", name, cSource::ToChar(source));
+  else
+     nameSource = cString::sprintf("%s (%s)", name, *cSource::ToString(source));
+
+  shortNameSource = cString::sprintf("%s (%c)", shortName, cSource::ToChar(source));
+}
+
 const char *cChannel::Name(void) const
 {
   if (Setup.ShowChannelNamesWithSource && !groupSep) {
-     if (isempty(nameSource) || nameSourceMode != Setup.ShowChannelNamesWithSource) {
-        if (Setup.ShowChannelNamesWithSource == 1)
-           nameSource = cString::sprintf("%s (%c)", name, cSource::ToChar(source));
-        else
-           nameSource = cString::sprintf("%s (%s)", name, *cSource::ToString(source));
-        }
-     return nameSource;
+     if (!isempty(nameSource))
+        return nameSource;
      }
   return name;
 }
@@ -124,9 +132,8 @@ const char *cChannel::ShortName(bool OrName) const
   if (OrName && isempty(shortName))
      return Name();
   if (Setup.ShowChannelNamesWithSource && !groupSep) {
-     if (isempty(shortNameSource))
-        shortNameSource = cString::sprintf("%s (%c)", shortName, cSource::ToChar(source));
-     return shortNameSource;
+     if (!isempty(shortNameSource))
+        return shortNameSource;
      }
   return shortName;
 }
@@ -204,9 +211,7 @@ bool cChannel::SetTransponderData(int Source, int Frequency, int Srate, const ch
      srate = Srate;
      parameters = Parameters;
      schedule = NULL;
-     nameSource = NULL;
-     nameSourceMode = 0;
-     shortNameSource = NULL;
+     UpdateNameSource();
      if (Number() && !Quiet) {
         dsyslog("changing transponder data of channel %d (%s) from %s to %s", Number(), name, *OldTransponderData, *TransponderDataToString());
         modification |= CHANNELMOD_TRANSP;
@@ -271,15 +276,12 @@ bool cChannel::SetName(const char *Name, const char *ShortName, const char *Prov
            dsyslog("changing name of channel %d from '%s,%s;%s' to '%s,%s;%s'", Number(), name, shortName, provider, Name, ShortName, Provider);
            modification |= CHANNELMOD_NAME;
            }
-        if (nn) {
+        if (nn)
            name = strcpyrealloc(name, Name);
-           nameSource = NULL;
-           nameSourceMode = 0;
-           }
-        if (ns) {
+        if (ns)
            shortName = strcpyrealloc(shortName, ShortName);
-           shortNameSource = NULL;
-           }
+        if (nn || ns)
+           UpdateNameSource();
         if (np)
            provider = strcpyrealloc(provider, Provider);
         return true;
@@ -805,9 +807,7 @@ bool cChannel::Parse(const char *s)
         free(tpidbuf);
         free(caidbuf);
         free(namebuf);
-        nameSource = NULL;
-        nameSourceMode = 0;
-        shortNameSource = NULL;
+        UpdateNameSource();
         if (!GetChannelID().Valid()) {
            esyslog("ERROR: channel data results in invalid ID!");
            return false;
diff --git a/channels.h b/channels.h
index 25ddc3d1..5c61a66f 100644
--- a/channels.h
+++ b/channels.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: channels.h 5.2 2021/05/21 09:38:34 kls Exp $
+ * $Id: channels.h 5.3 2024/03/02 16:21:16 kls Exp $
  */
 
 #ifndef __CHANNELS_H
@@ -87,6 +87,7 @@ class cChannels;
 class cChannel : public cListObject {
   friend class cSchedules;
   friend class cMenuEditChannel;
+  friend class cMenuSetupMisc;
   friend class cDvbSourceParam;
 private:
   static cString ToText(const cChannel *Channel);
@@ -123,9 +124,8 @@ private:
   int number;    // Sequence number assigned on load
   bool groupSep;
   int __EndData__;
-  mutable cString nameSource;
-  mutable int nameSourceMode;
-  mutable cString shortNameSource;
+  cString nameSource;
+  cString shortNameSource;
   cString parameters;
   mutable int modification;
   time_t seen; // When this channel was last seen in the SDT of its transponder
@@ -133,6 +133,7 @@ private:
   cLinkChannels *linkChannels;
   cChannel *refChannel;
   cString TransponderDataToString(void) const;
+  void UpdateNameSource(void);
 public:
   cChannel(void);
   cChannel(const cChannel &Channel);